Pen leakage indicators A pocket mark from pen leaking in pocket may come from several routes, and each leaves a different pattern. Typically, leakage begins at a joint: the refill nose, cartridge seal...
A dark mark in a pocket is not always a refill leak. True leakage means ink has escaped the refill body, rear plug, or tip assembly. A leakproof pocket pen may reveal ink on fabric when the cap or bar...